What is NOT a typical variation of the experimental method

A)  using an experimental group only and no control group 
B)  manipulating more than one independent variable 
C)  using one group of subjects who serve as both the experimental group and as their own control 
D)  measuring more than one dependent variable

Experimental Group

The group in an experiment that receives the variable being tested, which is contrasted with a control group that does not receive the experimental treatment.

Independent Variable

An element or factor in an experiment that is deliberately manipulated to observe its effect on the dependent variable.

Dependent Variable

In an experiment, the variable that is being tested and measured, expected to change as a result of manipulations to the independent variable.